—Would you like to play table tennis with me this afternoon?
—I'd like to. ________ I'm afraid I have no time.
句意：——你今天下午愿意和我一起打网球吗?——我愿意，但恐怕我没有时间。
考查并列连词。so 所以；or 或者，否则；but 但是；and 并且，和。空格前“我愿意”和空格后“恐怕我没有时间”是转折关系，用but。故选C。
—Would you like to play table tennis with me this afternoon?
—I'd like to. ________ I'm afraid I have no time.
Susan ________Tina are good friends.
Miss Zhao is very helpful. She often helps us ____we are in trouble.
He was so tired that he fell asleep ___he went to bed.
—Which book do you prefer, Harry Potter or Treasure Island?
—Harry Potter, of course, ____I ___ my sister likes it.
Millie’s research paper isn’t up to standard______ she has worked at it for two weeks.
—Don't forget to protect your eyes well______ you take online classes.
—OK. Thank you, Sir.
_____ the outbreak of COVID-19 is a terrible blow to the country, the government is trying hard to bring the situation under control.
_______ you have problems, just let me know. I'll always be there for you.
We should protect the environment _______ we can make a better world to live in.
